<template>
  <div class="bottom-bar">
    <check-button class="select-all" :isChecked="isSelectAll" @click.native="checkClick"></check-button>
    <span>全选</span>
    <span class="total-price">合计: ¥{{ totalPrice }}</span>
    <span class="buy-product">去计算({{ checkLength }})</span>
  </div>
</template>

<script>
import CheckButton from 'components/content/checkButton/CheckButton'

import { mapGetters } from 'vuex'

export default {
  name: 'BottomBar',
  components: {
    CheckButton
  },
  computed: {
    ...mapGetters(['cartList', 'cartLength']),
    totalPrice() {
      const cartList = this.cartList
      return cartList
        .filter(item => {
          return item.checked
        })
        .reduce((preValue, item) => {
          return preValue + item.count * item.price
        }, 0)
        .toFixed(2)
    },
    checkLength() {
      return this.cartList.filter(item => item.checked).length
    },
    isSelectAll: function() {
      if (this.cartList.length === 0) return false
      // return this.checkLength === this.cartList.length
      // return !this.cartList.find(item => item.checked === false)
      // return !this.cartList.some(item => item.checked === false)
      return this.cartList.every(item => item.checked === true)
    }
  },
  methods: {
    checkBtnClick: function() {
      // 1.判断是否有未选中的按钮
      let isSelectAll = this.$store.getters.cartList.find(item => !item.checked)

      // 2.有未选中的内容, 则全部选中
      if (isSelectAll) {
        this.$store.state.cartList.forEach(item => {
          item.checked = true
        })
      } else {
        this.$store.state.cartList.forEach(item => {
          item.checked = false
        })
      }
    },
    checkClick() {
      if (this.isSelectAll) {
        this.cartList.forEach(item => (item.checked = false))
      } else {
        this.cartList.forEach(item => (item.checked = true))
      }
    }
  }
}
</script>

<style scoped>
.bottom-bar {
  width: 100%;
  height: 44px;
  background-color: #eee;
  position: fixed;
  bottom: 49px;
  left: 0;
  box-shadow: 0 -2px 3px rgba(0, 0, 0, 0.2);
  font-size: 14px;
  color: #888;
  line-height: 44px;
  padding-left: 35px;
  box-sizing: border-box;
}

.bottom-bar .select-all {
  position: absolute;
  line-height: 0;
  left: 12px;
  top: 13px;
}

.bottom-bar .total-price {
  margin-left: 15px;
  font-size: 16px;
  color: #666;
}

.bottom-bar .buy-product {
  background-color: orangered;
  color: #fff;
  width: 100px;
  height: 44px;
  text-align: center;
  line-height: 44px;
  float: right;
}
</style>
